Device for distributing air or gases in fluids



March 29, 1932. o. HURLIMANN DEVICE FOR DISTRIBUTNG AIR OR GASES IN FLUIDE Filed March ll. 1951 Patented Mar. l29,E 1932` vUNirEo STATES OSKAR HRLIMANN; OF MUNICH,-GERMANY DEVICE FOR DISTRIBUTING .AIRLOEv GASES IN IELUIDS Application led'lltarchv 11, 1931, SerialfNo. 521,81*?,fand in (v'fermany September `30, 1930.

The presentV invention relates to devices for distributing carbon dioxide, air and other gaseous substances in water or other fluids in y the form of minute gas bubbles, for instance X5 in order to aerate watery or for bathing pui.

poses.

The hitherto known devices of4 this kind comprise Aan inner air supply tube, which is f sired, because it is veryrv diflicult to maintain the filler bodyy between the inner Vand the Y outer tube in a state of Auniform density. This difficulty is of course enhanced, when the ydevice is permanently used and the fillerY mass is moistened through the fluid. u

Accordingy to the rpresent invention thek A above named drawbacks are avoided by ar- 30, ranging the inner and the outer'tube coaxially in such a manner, thatthe inner tube fits in thel outer one and the intermediate space as well as the filler mass are dispensed with. Thejinner tube is equipped with perfoiations through which the gas or air will escape and the outer tube is also equipped f with perforations orslots the positions of whichY relative to the perforations of the in- Y ner tube may be adjusted after desire.`

" In order that the air escaping from the inner tube may enterthe perforations or slots in the outer tube in finely subdivided state,fvery ne rifles or grooves are formed in the outer surfaces of the'inner tube or theinner surface of the outer ltube or in both surfaces. Such riflesmay for instance con-` sit of densely spaced circular grooves or yof continuous spiral grooves.v In 'order to keffect an even distributionof the air escaping from kindy are technically com-4 Vwith,zuoer'tures V3, which are interconnected the inner tube the outer surfaceof Vthis tube may be formed with one or more narrow longitudinal grooves running parallelly to the length axis ofthe tube and interconnecting the perforations in the same'. kExperiments y .5 have shown, that a device of this, kind will 55' effect a -veryfineand uniform distribution of air and gases in the form of smallbubbles overetheentire length of the system, without the state of the yfluid -beinguchanged'thereby. When the above described device is used 60 a distribution is obtained, which is just as thorough as that obtained by means `of a filler mass, arranged between the tubes` and the drawbacks 0adhering to this mass are avoided.

A constructional form of the invention is f .shownlby'way of exampleinthe accompany; .lng drawings.y i' o s 1;.is a longitudinal sectional view taken on thenline I-I in Figs. 2 and 3 and showing both tubes in operativeY position.

Fig. 2 yshows the outer tube and the slots formed therein. f Figjisa partially sectional view,- show? ing' the inner tube ofthe device. 75

l denotes the inner tube which fits inthe' outer tube 2. rThe bottoml ofthe'inner" tubel contacts v with the vbottom 2y of the outer tube2. The inner tube 1 is formed` by v'means ofv grooves 4 through which the air escaping fromther apertures 3 will How lin the vform of a band; The outer tube 2 is also formed with apertures or slots 6. These slots are` preferably arrangedin such a man,-k ner, that they ,form an angle with the lon-v gitudina-laxis of the tube. By rotating the tubes in relationto each other, the slotsuin the outer tube may be brought into communiou .y

cation with different apertures in theinner tubey l. The exterior surface of the innerr`r tube or the kkinterior surface of the outer tube or both ythese surfaces arey formed` with very Y line grooves -or rifles having a width of frac#4 95 tions of a millimeter. Said grooves or rifles may for instance be forniedas tightly spaced circles or ask a continuous spiral line.y TheV air will leave'the grooves and enter the slotsv 6 in the outer tube in the form of minutebubbles which are uniformly distributed in the surrounding fluid.

The outer tube is at its open end preferably equipped with a thread 7 by means of which the apparatus may be connected to a nipple or the like, which communicates with a source of air or gas.

If desired a plurality of devices may be arranged in parallel relation and be connected to a common source of gas or air.

When the exterior surface of the inner tube and the interior surface of the outer tube are grooved the cross-sectional area of the air channels and the size of the air bubbles may be changed simply by rotating the inner tube about a small angle in relation to the outer tube. It will be understood, that the described device is capable of considerable modification Without departure from the spirit of the invention and the scope of the claims.

I claim 1. A device for distributing air, gases land the like in fluids, comprising an outer tube, inclinedly arranged slots in said tube, an inner perforated tube, longitudinally running relatively shallow grooves interconnecting the periorations in the inner tube and a system of fine grooves distributed over the exterior surface of the inner tube and adapted to'communicate with the perforations in the inner tube and the slots in the outer tube.

2. A device for distributing air, gases and the like in iluids, comprising an outer tube, inclinedly arranged slots in said tube, an inner perforated tube, longitudinally running relatively shallow grooves interconnecting the perforations in the inner tube and a system of fine grooves distributed over the interior surface of the outer tube and adapted to communicate with the perforations in the inner tube and the slots in the outer tube.

3. A device for distributing air, gases and the like in fluids, comprising an outer tube, inclinedly arranged slots in said tube, an inner perforated tube, longitudinally running relatively shallow grooves interconnecting the perforations in the inner tube and a system of fine grooves distributed over the exterior surface of the inner tube and the interior surface of the outer tube and adapted to communicate with the perforations in the inner tube and the slots in the outer tube.

4. Device for dispersing air or gas in the form of line bubbles or beads, comprising two tightly interfitted tubes of which the inner one serves for conducting that air which is to be dispersed in the form of bubbles, said tube being provided with slits or openings circumferentially staggered for the discharge of the air and there being provided between the inner surface of the outer tube and the outer surface of the inner tube extremely fine circular or spiral grooves. whereby the air leaving the openings in the inner tube is con- OSKAR HRLIMANN. 

